gangboard vs gangplank

gangboard and gangplank both are nouns.

Word	Noun	Adjective	Verb	Adverb
gangboard	Yes	No	No	No
gangplank	Yes	No	No	No

As nouns, gangboard and gangplank are synonyms defined as:

gangboard and gangplank: a temporary bridge for getting on and off a vessel at dockside

Other synonyms of gangboard include gangway.

gangboard (noun)	gangplank (noun)
a temporary bridge for getting on and off a vessel at dockside	a temporary bridge for getting on and off a vessel at dockside